Safety-razor.



T 0. DURHAM; SAFETY RAZOR. APPLICATION FILED JAN. 7, 1910.

Patented Apr. 5, 1910,

UNITED simtrns '1 A *T QF-E .coivirANY. or New Yoi x, N. Y,,- ACORPORATION, or NEwIY'oRKI shun-gazes Original application filed March8, 1909, Serial-No. 482,148.f Divided iit is applic fi ed January'7,4910. Serial message. I y

To all whom it may concern." I

Be it known-that I, Tiioii'as G. DURHAM, a citizen of the United States,residing at New York, county of New York, and State of New York, haveinvented a new and useful Iinprdveiuent in Safety-Razors, of which thefollowing is a specification.

This invention relates to an improvement in safety razors of the'ty edisclosed in my co-pending application fi ed March 8, 1909,

.Serial N o. 482,143, of which this application is a division, and oneof the objects thereof is to provide a device of this character in whichthe guard will not interfere with the rte-sharpening or stropping of theblade.

A further object is to provide a device in t ' nary type.

With these and other objects not specifically mentioned in view, theinvention consists in certain constructions and combinationswhich willbe hereinafter fully. de-

scribedand then specifically dpointed out in the claims herei'intoappende In the accompanying drawings, which! form a part of this secification and in which like characters 0 reference indicate the sameparts, Figure 1 illustrates a: device constructed in accordance with theinvention, Fig. 2 is a detail view of the safety guard 'used inconnection with the structure shown in Fig. 1, and Fig. 3 is an enlargedsectional view on the line 3-3 in Fig. 1.

Iii-carrying the invention into effect, there is provided a blade and a.cooperating safety uard, both ofwhich may vai within wide imits. In thedevice selecte the invention, there is provided a' blade 1 mounted in aconventional handle 2 and havin a thick back'3 and a cutting edge 4 bothincluded within a prism the apex of which is the cutting 'edge and thebase of which includes the back 3 of the blade, this prism being.determined by the iiiitial shapmg or shar ening of the blade. This prismis indicat in Fig. 3 by the broken line Itis well known in the tradethat razor blades are ground so that what is termed 'the angular facesof the edge of the blade;

that is to say, the sides of the blades adjacent the cutting edge theplanes of which intersect at the line of the edge, form a verysmallincluded angle found in many years simpxle and eiiicient and which mayhoused to illustrate In or er'to maiiitainthe higli THOMAS-C. DURHAM. ornew Yoaic N. Y.,'" i ssioiioa 'ro nu'iiriaiinormx imzo i' i f at- "lateiit' afar :15, 1910.1.

the device, whei'i ;it becomes nec.- saiy -to reg sharpen the blade, itisi npoiftant thati th'ej includedangle of the faces, or the initial-fprismatic shape of the blade asawh'ole, be:

preserved, for. if the blade is re-sliarpenedj in such. amannei'f tiatfa wider angle is; formed adjacent the utting edge the ed o will beblunterand lesd'eflicient, and if t e blade is re-sharpened in suchamanner as to. make the thin edge of the blade still thinner the edgewill lose its rigidity and become too flexible. In the presentinvention, the structure em'- loyed is ofsuch a character that the bla emay re sharpened at its initial angle and without alteringits initialprismatic shape upon which its etficiency depends.

There is provided a safety guardbeyond the edged the blade whichcooperates with the blade. \Vhilein'c'ertain constructions thisguard'may be otherwise formed, in the b'est constructions and as shown,- acorrugated guard '6 is employed, this guard having upturned ends 7pivoted at 8 to the blade 1 One 'of the upturned ends of the guardisprovided with a stop-9 limitingthe swinging movement ofthe guardacross the edge of the blade. 3

It will .be readily understood that with the structure illustrated-theblade may bestropped or otherwise re-sharpend in the .usual mannerwithout removing the guard, since the latteris free to swing from oneside of the blade to the otheracross its ed 'e, the swingi'ig movementbeing limited by t e stop 9 and that in applying'tl e device to the facethe guard will "be automatically swung" by contact with the face to itscbrrectv position with respect to the cutting-edge of the blade,whichever side may be presented to the face.-

Changes and variations may be made in the structure by means of whichthe invention is carried into effect. I The jnvention, therefore, is notto be restrictedi to the' precise details of the structure shownunddescribed. a \Vhat is claimedis:

1. A safety razor comprising a blade having a thick back and a cuttingedge both ineluded within a prism the apex of: which is the cutting edgeand the base of which inbe ng determined by the initial eludes the buckof-jthe'blade this prism shaping of the blade. and a guard beyond thecutting edge of the blade and pivotally connected with th'c blade;whereby-the blade may be sharpened at its initial angle with the guardin position, substaiitially as described.

2. A safety razorcomprising a blade hav ing a thick back and acutting ede both included within a prism the apex 0 which is thc1cutt-ing)edge-andthe base of which includes. the being determined by the initial shapingof the blade; and a guard beyond the cutting edge of the blade andhaving upturned ends pivoted to the blade, whereby the blade may esharpened at its initial angle with the guard in position, substantiallyas described.

3. A safety razor comprising a blade havack of the blade, this prism thecutting edge of the bladeand having upturned ends pivoted tot-he blade,whereby a the blade may be sharpened at its initial tia ly as described.

In testiinony whereof, I have signed my.

name to this specification in the presence of two subscribing witnesses.

THOMAS CQDURHAM.

\Vitnesses I G. P; STACY,

SYDNEY I. Puasoo'rr;

an le with the guard inposit-ion, substan-

